RFR(XS): 8025519: [TESTBUG] runtime/7107135/Test7107135.sh need to use COMPILEJAVA for javac task

[Calvin Cheung]

Some of the test shell scripts are using the TESTJAVA env variable which 
may point to a JRE, not to a JDK which contains the required tools such 
as javac and header files. This fix is to change TESTJAVA to COMPILEJAVA 
in 3 test shell scripts which have the problem.

bug: https://bugs.openjdk.java.net/browse/JDK-8025519

webrev: http://cr.openjdk.java.net/~ccheung/8025519/webrev/

tests: (on linux-x64)
     manually run the affected test cases
     using jtreg to run the affected test cases

thanks,
Calvin